The projectwork “automatic drilling machine” is mainly aimed to do the work of drillingwork at industry.
The procedure is described in this as per block wise. The machineis designed with a drilling motor, and the motor functions independently.Drilling depth of the motor can be programmed through the PLC.
The drillingmotor is moved in vertical direction through power feed technology designed withuniversal motor. The universal motor used to move the drilling motor up &down directions is aimed to pull down the drill motor while drilling the holeover the job. Here some force is applied such that the machine can be able todrill the hole over light metal work. The mainpurpose of this machine is to control the drilling depth accurately; thereforethe control circuit should able to recognize the target entered through PLC.Based on the data the controller can be programmed through PLC. Now thecontroller can recognize the movement of mechanism by counting the pulsesinternally. The entire vertical moving mechanism that contains drilling motoris coupled with power feed motor can be called as mechanism. Details about the components usedare given below.
Spindle: The spindle grips the drill or cutting tools and rotates ina fixed position in a cover. Sleeve:The sleeve or quill assemblage does not revolve but may glidein its bearing in a direction parallel to its axis. When the sleeve carryingthe spindle with a cutting tool is depressed, the cutting tool is fed into thework: and when it’s progressed upward, the cutting tool is inhibited from thework. Feed weight applied to the sleeve by hand or power causes the revolvingdrill to cut its way into the work a fraction of an mm per revolution.
Column:The column is cylinder-shaped in shape and built rough andsolid. The column supports the head and the sleeve or quill assembly. Head:The head of the drilling machine is collected of the sleeve,a spindle, an electric motor and feed apparatus.
The head is fastened to thecolumn. Worktable:The worktable is reinforced on an arm on to the column. Theworktable can be attuned vertically to put up different heights of work or itcan be swayed completely out of the way. It may be tilted up to 90 degree ineither direction, to allow long pieces to be end or angle drilled.Base:The base of the drilling machine provisions the entiremachine and when fastened to the floor, delivers for vibration-free process andbest machining accurateness.
The top of the base is like to the worktable andmay be furnished with t- slot for mounting work too larger for the table. Feed:The hand- feed drilling machines are the modest and most mutualtype of drilling machines in use today. These are light duty machine that are functionedby the operator, using a feed moved, so that the operator is able to “sense”the action of the cutting tool as it cuts through the work piece. Thesedrilling machines can be bench or floor attached. Powerfeed: The control feed drilling machine are usually bigger and heftierthan the hand feed ones they are furnished with the capability to feed thecutting tool in to the work mechanically, at predetermined deepness of cut perrevolution of the spindle these machines are used in preservation for intermediateduty work or the work that uses bulky drills that need power feed larger workpieces are usually fastened directly to the table or base using t –bolts andclamps by a slight work places are held in a vise. A depth –stop mechanism is situatedon the head, near the spindle, to assistance in drilling to a detailed depth. Sensitiveor Bench Drilling Machine This kind of drill machine is used for very light works.
Fig.1 demonstrates the sketch of sensitive drilling machine. The perpendicular column carries a spinning table the height of which can be attuned rendering to the work piece stature. The table can also be swayed to any wanted position. At the top of the pillar there are two pulleys linked by a belt, one pulley is attached on the motor shaft and other on the machine spindle.
Vertical drive to the spindle is given by the feed knob by the worker. Worker minds the cutting action so delicate drilling machine. Drill holes from 1.5 to 15mm